In episode 96 of Semantic Mastery's weekly Hump Day Hangouts, one participant asked how someone can use Google Adwords keyword tool without having to set up a payment scheme in making the campaign.
The exact question was:
Recently my Keyword Planner started showing ranges for search volume, instead of specific numbers. What would you recommend besides paying for a campaign? Would there be a way to set up a campaign without ever having to pay?